Water Resource Management

Groundwater

Groundwater hydrology is an interpretive science: we can't observe the aquifers directly so we must interpolate and extrapolate our understanding from water-level measurements from observation wells. Stevens has expertise for measuring both water quantity and water quality.

Soil Monitoring

Over the past few decades, soil monitoring has become increasingly important. Environmental factors such as climate change, dwindling water resources, and threatened habitats are driving the need to monitor the environment and implement better policies to protect it. Many natural processes in the environment are driven by or in some ways related to soil hydrological processes. Monitoring soil moisture conditions provides important information for the protection of, and in the understanding of local and regional water resources.

JL-2

Smart SDI-12 power management control

The Stevens JL-2 is a temperature compensated, tapered charge controller that has been independently tested and proven to extend the performance life of a battery beyond leading regulators. The JL-2 has set-point adjustable float chargers that can be used with PV arrays or power supplies having power ratings as high as 40 watts (higher panel wattage can be handled under controlled conditions).

The regulator features low current consumption (typically less than 50 microamps), and battery temperature sensing and compensation. The optional external temperature sensor is held in contact with the battery case via an 8 foot cable. The float threshold is adjustable between 11 and 16 volts via a trimpot. The float level of the regulator changes by approximately -23 mV/degree C; colder temperatures causing a higher float level.

The JL-2 charge controller will charge a fully discharged battery at the full current output of the solar panel and will automatically taper the charging current to zero as the terminal voltage of the battery approaches the float level of the charger. The JL-2 then provides the required trickle current to maintain the battery at the float level, assuming sufficient sunlight.

An LED is illuminated from the solar panel current signifying ample current for battery charging and proper operation of the regulator.

The automatic current charge management and temperature compensation feature ensures the battery will not be damaged by overcharging and will increase the battery’s performance life.

Technical Specifications

Power

Max. inut voltage

28 V

Max. charging current and/or power dissipation

4 A
JL-2 will handle 10 A if the power dissipated by the controller does not exceed 15 W.

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